The online multiplayer mode of Black Ops revolves around, usually two teams on a specific mission. For example in Team Deathmatch the team with the most kills wins, while in Capture the Flag, players take the other team's flags and return it to their own base. Additionally, there is Free For All in which players aren't separated into teams. Not including Downloadable maps, there are 14 different maps.

Black Ops retains the experience points and unlockable reward system that has been kept sinceCall of Duty 4. The game's multiplayer focuses on socialization and customization. "Create-a-Class 2.0" allows enhanced personalization with appearance items as well as upgradable perks; weapons are extensively customizable with writing, emblems, attachments and camouflage painting. Even reticles can be modified. There are more than one style for an attachment, which allows for a lot more personalized weaponry; for example, the player can choose between a red dot sight or a reflex sight, both of which share many of the same traits, although the red dot fills up less of the screen (something desired by many players). Character models depend on the first tier perk instead of the weapon's type. Furthermore, face paints can be unlocked. New custom killstreak rewards include explosive R/C cars, guided missiles and controllable attack helicopters.

A currency system has been implemented allowing players to buy weapons, accessories and clothes. Players can gamble with their "COD Points" in a free for all based playlist called "Wager Match", which is composed of four game modes.Time limited objectives known as "Contracts" can be purchased to gain more currency and experience points. The progression system is not featured in local split screen multiplayer. In local split-screen play, all character customization options are already unlocked. Players can no longer define game rules such as win conditions.

Players can play alone or with friends against AI opponents in "Combat Training" with a separate progression system. Online split-screen is re-introduced on Xbox 360 and PS3. The guest account can rank up but is reset after each sign out. Only on Xbox 360, a second Gold Xbox Live account can be used to keep the second player's progression.

For the first time in the series, clips from online gameplay can be recorded. Some specific features that have been removed from the PC version of Infinity Wards Modern Warfare 2 return, such as lean, mod tools, the developer console and dedicated servers.Dedicated servers are exclusively provided by Game Servers.Steam is the exclusive platform for Black Ops on PC, and the game is protected by Valve Anti Cheat 

The Wii version of the game includes in-game voice chat. This is the first Call of Duty title to include the voice chat feature for the Wii. Nintendo and PDP have partnered to release the first headset to be used with the Wii known as PDP's Hand Badger set

A zombie cooperation mode, titled "Zombies", is included in the game. Originally being featured in World at War, it was revamped to be included into Black Ops. It is a four-player online and two-player split screen co-op mode (which can also be unlocked online). In the map "Five",There is one map based on the original game called Kino Der Toten ('Theatre of the dead' or "Cinema of the dead" in German). This map features the characters from World at War -- Edward Richtofen, Tank Dempsey, Takeo Masaki, and Nikolai Belinski. Limited editions of the game offers four zombie maps from World at War. There is an unlockable top-down two-stick arcade-shooter version of Zombies known as Dead Ops Arcade. Included in the First Strike Map Pack is Ascension. Ascension takes place in an abandoned Soviet Cosmodrome, and like Kino der Toten, features the characters from World at War. Additionally, it includes two new weapons(the Gersch Device and Matryoshka Dolls), as well as two new perks(PhD Flopper and Stamin-Up). A new enemy, the Space Monkeys, appear in this map, replacing the Hellhounds and the Pentagon Thief.

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